bug#48789: acknowledged by developer (control message for bug #50058)

[Eli Zaretskii]

> From: akater <nuclearspace@gmail.com>
> Date: Fri, 27 Aug 2021 22:04:15 +0000
> 
> However, I still can't build on musl due to seccomp-related issue.
> 
> In the original message, I forgot to attach actual output from GCC; here
> it goes:
> 
> x86_64-gentoo-linux-musl-gcc -fno-common -Wall -Warith-conversion
> -Wdate-time -Wdisabled-optimization -Wdouble-promotion -Wduplicated-cond
> -Wextra -Wformat-signedness -Winit-self -Winvalid-pch -Wlogical-op
> -Wmissing-declarations -Wmissing-include-dirs -Wmissing-prototypes
> -Wnested-externs -Wnull-dereference -Wold-style-definition -Wopenmp-simd
> -Wpacked -Wpointer-arith -Wstrict-prototypes -Wsuggest-attribute=format
> -Wsuggest-attribute=noreturn -Wsuggest-final-methods
> -Wsuggest-final-types -Wtrampolines -Wuninitialized -Wunknown-pragmas
> -Wunused-macros -Wvariadic-macros -Wvector-operation-performance
> -Wwrite-strings -Warray-bounds=2 -Wattribute-alias=2 -Wformat=2
> -Wformat-truncation=2 -Wimplicit-fallthrough=5 -Wshift-overflow=2
> -Wvla-larger-than=4031 -Wredundant-decls -Wno-missing-field-initializers
> -Wno-override-init -Wno-sign-compare -Wno-type-limits
> -Wno-unused-parameter -Wno-format-nonliteral -I. -I../src -I../lib
> -I. -I./../src -I./../lib -Wl,-O1 -Wl,--as-needed -march=native -O2
> -pipe seccomp-filter.c \ -lseccomp -o seccomp-filter
> seccomp-filter.c: In function 'export_filter':
> seccomp-filter.c:134:12: warning: implicit declaration of function 
> 'TEMP_FAILURE_RETRY' [-Wimplicit-function-declaration]
>   134 |   int fd = TEMP_FAILURE_RETRY (
>       |            ^~~~~~~~~~~~~~~~~~
> seccomp-filter.c:134:12: warning: nested extern declaration of 
> 'TEMP_FAILURE_RETRY' [-Wnested-externs]
> /usr/lib/gcc/x86_64-gentoo-linux-musl/10.3.0/../../../../x86_64-gentoo-linux-musl/bin/ld:
>  /var/tmp/portage/app-editors/emacs-28.0.9999/temp/ccIiDmil.o: in function 
> `export_filter':
> seccomp-filter.c:(.text+0x199): undefined reference to `TEMP_FAILURE_RETRY'
> collect2: error: ld returned 1 exit status

I believe TEMP_FAILURE_RETRY is glibc-specific; the configure script
should test for it, and disable seccomp if not supported (or code
around its absence, if possible).

But I agree with Lars that this warrants a separate bug report.